1. Brusca RC, Brusca GJ, Haver N, Burness TJ (2003) Invertebrates. Sinauer Associates
2. Invertebrate Zoology;A Kaestner,1967
3. Invertebrate Zoology;A Kaestner,1967
4. Invertebrate Zoology;A Kaestner,1970
5. Barnes RSK, Calow P, Olive PJW (1988) The Invertebrates A New Synthesis. Blackwell, Oxford